CN110989052A - Brightness enhancement film with gradient refractive index of multilayer structure - Google Patents
Brightness enhancement film with gradient refractive index of multilayer structure Download PDFInfo
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- CN110989052A CN110989052A CN201911029111.4A CN201911029111A CN110989052A CN 110989052 A CN110989052 A CN 110989052A CN 201911029111 A CN201911029111 A CN 201911029111A CN 110989052 A CN110989052 A CN 110989052A
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- enhancement film
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/11—Anti-reflection coatings
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/11—Anti-reflection coatings
- G02B1/113—Anti-reflection coatings using inorganic layer materials only
- G02B1/115—Multilayers
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133504—Diffusing, scattering, diffracting elements
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133504—Diffusing, scattering, diffracting elements
- G02F1/133507—Films for enhancing the luminance
Abstract
The invention discloses a brightness enhancement film with a multi-layer structure and gradually changed refractive index, which comprises a first surface and a second surface on the opposite side, which are arranged in parallel, and a stack of N micro layers with positive refractive index, wherein the stack of the micro layers with positive refractive index is arranged between the first surface and the second surface and is arranged as an adjacent micro layer, the refractive indexes of the N micro layers with positive refractive index from the first surface to the second surface are sequentially reduced, and infrared transparent diffusion particles are arranged on the first surface, so that the brightness enhancement film has high transmittance for visible light emergent from the second surface to the first surface, and meanwhile, the brightness enhancement film has high transmittance for infrared light.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a multilayer-structure gradient-refractive-index brightness enhancement film for fingerprint identification in an LCD screen and an LCD module.
Background
Fingerprint sensing and matching is a reliable and widely used technique. A common method of fingerprint identification involves scanning a sample fingerprint or an image thereof and storing the image and/or unique features of the fingerprint image, which can be compared with information of reference fingerprints already present in a database to determine the correct identification of the user, e.g. for authentication purposes. In particular, in-display (in-display) fingerprinting is now becoming increasingly popular due to its ease of operation and versatility and its suitability for compact portable electronic devices.
At present, the fingerprint identification display device in the screen mainly adopts an OLED display, which is mainly because the OLED display is thinner and lighter and is easier to integrate a fingerprint identification sensor. However, Liquid Crystal Displays (LCDs) have a cost advantage over OLEDs. The existing solution of the fingerprint identification display device in the LCD screen is to use a CMOS (Complementary Metal Oxide Semiconductor) image sensor under the LCD screen, where the CMOS image sensor is not completely built in the display, but can realize fingerprint sensing by sacrificing some thickness in the active area of the display. However, the in-screen fingerprint identification display device based on the LCD display is not fully mature, and especially effective penetration and accurate collection of fingerprint identification signals on the LCD module cannot be considered at the same time.
In the in-screen fingerprint recognition display device of the LCD display, as shown in fig. 1, by recognizing a fingerprint pressed on a glass cover plate 140 covering the LCD display screen; however, the optical signal for identifying the fingerprint at least passes through the LCD panel and the glass cover plate 140, and since the LCD panel is composed of the LCD module 130 and the backlight module 120, the glass cover plate has a certain thickness. Therefore, the optical signal is severely refracted and scattered, or even totally reflected, during the process of transmitting through the LCD module, the backlight module and the glass cover plate. Especially, the feedback optical signal carrying the biometric fingerprint information is seriously affected by a plurality of functional optical films in the backlight module, such as a brightness enhancement film, a diffusion sheet, a reflection sheet and the like to refract, scatter and reflect the feedback optical signal, thereby causing the loss of the feedback optical signal or serious optical noise pollution, causing the optical sensor 110 below the LCD screen to collect ineffective and accurate signals, and further failing to identify the biometric fingerprint information.
The optical film in the backlight module which has the greatest influence on the accurate collection of the optical signals is the brightness enhancement film. In the prior art, a brightness enhancement film is disposed in a backlight module of an LCD to improve light emitting efficiency. Fig. 2 is a diagram of a conventional brightness enhancement film. As shown in fig. 2, the brightness enhancement film 310 includes a body portion 320 and a plurality of lens structures 330. The lens structures 130 are isosceles right triangular prisms and are formed in the body part 320 in a repeated arrangement and arranged in an array. Fig. 3 is a graph showing the relationship between viewing angle and brightness for the brightness enhancement film of fig. 2. As shown in fig. 3, wherein the abscissa represents the light output angle after light passes through the conventional brightness enhancement film and the ordinate represents the brightness of the light. The bold lines in fig. 3 represent the vertical dependence of the viewing angle on the brightness of a conventional brightness enhancement film, while the thin lines represent the horizontal dependence of the viewing angle on the brightness of a conventional brightness enhancement film. Therefore, the conventional brightness enhancement film has a light condensing effect. However, when the optical signal for collecting the biological fingerprint information passes through the conventional brightness enhancement film, especially the prism structure of the conventional brightness enhancement film, the optical signal is collected and scattered in a non-directional manner, so that the loss of the target feedback optical signal or the optical noise pollution is serious.
Therefore, the realization of the fingerprint identification function in the screen of the LCD display requires the improvement of the overall design of the backlight module, especially the design of the optical mechanism of the brightness enhancement film and the adjustment of other optical films designed to match the optical mechanism.
Disclosure of Invention
The invention mainly solves the technical problem of providing a brightness enhancement film, under the condition of not arranging a prism structure, incident light on one side has high transmittance, the diffusion of visible light is effectively increased, and the light generates a collimation effect, so that the directivity of light beams is improved, the brightness is increased, the film can be used as the brightness enhancement film, and infrared optical signals on two sides of the film can effectively penetrate through the film.
In order to solve the above technical problems, the present invention adopts a technical solution that a multilayer structure graded-index brightness enhancement film includes a first surface and a second surface opposite to the first surface, which are arranged in parallel, and a stack of N positive-index microlayers, the stack of positive-index microlayers is arranged between the first surface and the second surface and is arranged as an adjacent microlayer, the refractive indexes of the N positive-index microlayers from the first surface to the second surface decrease sequentially, the first surface is provided with infrared transparent diffusion particles, so that the brightness enhancement film has a high transmittance for visible light exiting from the second surface to the first surface, and the brightness enhancement film has a high transmittance for infrared light.
According to the brightness enhancement film with the multilayer structure and the gradient refractive index, under the condition that a prism structure is not needed, the refractive indexes of N micro layers from the first surface to the second surface are sequentially decreased, and the infrared transparent diffusion particles are arranged, so that optical deflection is formed in a limited space through the structural design, visible light can be emitted and diffused in the first surface after passing through a deflection path, the visible light utilization rate and the brightness are greatly improved, and the light beam directivity of the visible light is improved. On the other hand, the infrared light perpendicular to the graded index brightness enhancement film can penetrate through the brightness enhancement film, so that the infrared light can be collected on the second surface side of the graded index brightness enhancement film. In addition, the incident infrared light along the second surface to the first surface has high transmittance.
In a preferred embodiment, the brightness enhancement film is not provided with prismatic structures for light concentration.
In a preferred embodiment, the infrared transparent diffusion particles comprise Au, Ag, Al, Cu, Zn, Pt, Co, Ni, Cu2O、CuO、CdO、TiO2、SiO2At least one particle.
In a preferred embodiment, the infrared transparent diffusing particles are less than 50 microns in size, transparent to infrared light and scattering to visible light.
In a preferred embodiment, the refractive index of the positive refractive index microlayer is between 1.4 and 2.4.
In a preferred embodiment, the positive refractive index microlayer includes zinc silicon oxide having the formula ZnxSiyOz，0≤x≤1，0≤y≤1，0<z≤3。
In a preferred embodiment, the brightness enhancing film further comprises at least one negative index microlayer.
In a preferred embodiment, the negative index microlayers exhibit a negative index of refraction for visible light.
In a preferred embodiment, the negative refractive index microlayers are disposed between N of the positive refractive index microlayers.
In a preferred embodiment, the brightness enhancement film is provided with a light-gathering region provided with a light-gathering prism structure.
Drawings
The invention and its advantages will be better understood by studying the following detailed description of specific embodiments, given by way of non-limiting example, and illustrated in the accompanying drawings, in which:
FIG. 1 is an on-screen fingerprint identification display device of a prior art LCD display.
Fig. 2 is a representation of a prior art brightness enhancement film.
Fig. 3 is a graph of the relationship between viewing angle and brightness for a brightness enhancement film of the prior art.
FIG. 4 is a cross-sectional view of a multi-layer graded index brightness enhancement film of example 1.
FIG. 5 is a cross-sectional view of a multi-layer graded index brightness enhancement film of example 2.
Detailed Description
Referring to the drawings, wherein like reference numbers refer to like elements throughout, the principles of the present invention are illustrated in an appropriate environment. The following description is based on illustrated embodiments of the invention and should not be taken as limiting the invention with regard to other embodiments that are not detailed herein.
The word "embodiment" is used herein to mean serving as an example, instance, or illustration. In addition, the articles "a" and "an" as used in this specification and the appended claims may generally be construed to mean "one or more" unless specified otherwise or clear from context to be directed to a singular form.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Further, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise direct contact of the first and second features through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
Example 1
Referring to fig. 4, in the brightness enhancement film with graded index of refraction having a multi-layer structure in embodiment 1 of the present invention, under the condition of not providing a prism structure, the incident light on one side has a high transmittance, which effectively increases the diffusion of visible light, so that the light generates a collimation effect, thereby improving the directivity of the light beam, and increasing the brightness, so that the film can be used as a brightness enhancement film, and simultaneously, the infrared optical signals on both sides of the film can effectively penetrate through the film.
The technical scheme adopted by the embodiment is that the brightness enhancement film with the multi-layer structure and the graded refractive index comprises a first surface and a second surface on the opposite side which are arranged in parallel, and a stack of 4 positive refractive index micro-layers 101, 102, 103 and 104, wherein the upper surface of the positive refractive index micro-layer 101 is the first surface, and the lower surface of the positive refractive index micro-layer 104 is the second surface. The stack of positive refractive index microlayers being arranged between the first surface and the second surface and being arranged as adjacent microlayers, the refractive index n of the 4 positive refractive index microlayers 101, 102, 103, 104 from the first surface to the second surface1、n2、n3、n4The first surface is provided with infrared transparent diffusion particles in a descending order, so that the brightness enhancement film has high transmittance for visible light emitted from the second surface to the first surface, and meanwhile, the brightness enhancement film has high transmittance for infrared light.
According to the brightness enhancement film with the multilayer structure and the gradient refractive index, under the condition that a prism structure is not needed, the refractive indexes of 4 micro layers from the first surface to the second surface are sequentially decreased progressively and the infrared transparent diffusion particles are arranged, the light is subjected to optical deflection in a limited space through the structural design, and the visible light can be subjected to enhanced emergence and diffusion on the first surface after passing through a deflection path, so that the visible light utilization rate and the brightness are greatly improved, and the light beam directivity of the visible light is improved. On the other hand, the light path diagrams of L2 and L3 show that the infrared light perpendicular to the graded index brightness enhancement film can be transmitted through the brightness enhancement film, so that the infrared light can be collected on the second surface side of the graded index brightness enhancement film. In addition, the incident infrared light along the second surface to the first surface has high transmittance.
The infrared transparent diffusion particles comprise TiO2Nanoparticles and SiO2And (3) microparticles. Further, the infrared transparent diffusion particles are less than 50 microns in size, transparent to infrared light and scattering to visible light.
The refractive index of the positive refractive index micro-layer is between 1.4 and 2.4. The positive refractive index microlayer includes zinc silicon oxide having the formula ZnxSiyOz，0≤x≤1，0≤y≤1，0<z≤3。
Example 2
FIG. 5 is a cross-sectional view of a multi-layer graded-index brightness enhancement film of example 2. The difference and equivalence between example 2 and example 1 will be described below. The structure of the multilayer optical film of FIG. 2 comprises a stack of 5 positive refractive index microlayers 201, 202, 203, 205, 206 and one negative refractive index microlayer 204, wherein the upper surface of the positive refractive index microlayer 201 is a first surface, and the lower surface of the positive refractive index microlayer 206 is a second surface. In example 2 of the present invention, the effect of light passing through a stack of multiple microlayers having different positive and negative refractive indices is shown in fig. 5. The negative index microlayers 204 exhibit a refractive index nr for visible light. A first surface arranged in parallel and a second surface on the opposite side are arranged by means of a negative refractive index microlayer 204 and the refractive index n of 5 positive refractive index microlayers 201, 202, 203, 205, 206 from said first surface to said second surface21、n22、n23、n24、n20Sequentially decreasing, the negative refractive index microlayers 204 are disposed at the positive refractive index microlayersBetween layers 203 and 205, the structural design does not make the light form an optical loop in a limited space, and the visible light can be emitted and diffused at the second surface through the optical loop, so that the utilization rate and brightness of the visible light are greatly improved, and the beam directivity of the visible light is improved. On the other hand, the light path diagrams of L2 and L3 show that the infrared light perpendicular to the graded index brightness enhancement film can be transmitted through the brightness enhancement film, so that the infrared light can be collected on the second surface side of the graded index brightness enhancement film. In addition, the incident infrared light along the second surface to the first surface has high transmittance.
While the invention has been described above with reference to certain embodiments, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the various features of the various embodiments of the present disclosure may be used in any combination, provided that there is no structural conflict, and the combination is not exhaustively described in this specification for brevity and resource conservation. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. A brightness enhancing film, comprising: the multilayer film comprises a first surface and a second surface on the opposite side, which are arranged in parallel, and a stack of N positive refractive index micro layers, wherein the stack of the positive refractive index micro layers is arranged between the first surface and the second surface and is arranged as an adjacent micro layer, and is characterized in that the refractive indexes of the N positive refractive index micro layers from the first surface to the second surface are sequentially reduced, and infrared transparent diffusion particles are arranged on the first surface, so that the brightness enhancement film has high transmittance for visible light emitted from the second surface to the first surface, and simultaneously, the brightness enhancement film has high transmittance for infrared light.
2. The brightness enhancing film of claim 1 being provided without prismatic structures for light collection.
3. The brightness enhancing film of claim 1 wherein the infrared transparent diffusing particles comprise Au, Ag, Al, Cu, Zn, Pt, Co, Ni, Cu2O、CuO、CdO、TiO2、SiO2At least one particle.
4. The brightness enhancing film of claim 3, the infrared transparent diffusing particles being less than 50 microns in size, transparent to infrared light and scattering to visible light.
5. The brightness enhancing film according to claim 1, wherein the positive refractive index micro layer has a refractive index between 1.4 and 2.4.
6. The brightness enhancing film of claim 1, the positive index microlayer comprising zinc silicon oxide having the formula ZnxSiyOz，0≤x≤1，0≤y≤1，0<z≤3。
7. The brightness enhancing film according to claim 1, further comprising at least one negative index microlayer.
8. The brightness enhancing film of claim 1, the negative index microlayer exhibiting a negative index of refraction for visible light.
9. The brightness enhancing film of claim 1, the negative index microlayers being disposed between N of the positive index microlayers.
10. The brightness enhancing film of claim 1, being provided with a light concentrating area provided with a light concentrating prism structure.
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| CN201911029111.4A CN110989052A (en) | 2019-10-28 | 2019-10-28 | Brightness enhancement film with gradient refractive index of multilayer structure |
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| CN201911029111.4A CN110989052A (en) | 2019-10-28 | 2019-10-28 | Brightness enhancement film with gradient refractive index of multilayer structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115598886A (en) * | 2022-10-31 | 2023-01-13 | 江西联创致光科技有限公司（Cn） | Backlight source for enhancing infrared light transmittance and reducing foreign matter shielding property |
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| US20160091751A1 (en) * | 2014-09-30 | 2016-03-31 | Shenzhen China Star Optoelectronics Technology Co. Ltd. | Liquid crystal display device |
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